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Home / DTC / B1208 — Electronic instrument cluster row 1 switch short to ground

B1208 — Electronic instrument cluster row 1 switch short to ground

Detailed page for trouble code B1208.

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59brands
11,914generic
22,491specific
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Code

B1208

ALFA ROMEO B — Body

Electronic instrument cluster row 1 switch short to ground

Brand: ALFA ROMEO
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring contacting chassis ground
  • Corroded or water-damaged connector or pin
  • Failed (shorted) switch or internal cluster PCB fault
  • Incorrectly installed aftermarket accessory tapping the circuit
  • Poor or loose connector making intermittent short to ground

Symptoms

  • One or more Row 1 switch functions do not operate
  • Permanent or intermittent dashboard warning or fault lamp
  • Stored B1208 (and possibly related) DTC(s) in the cluster
  • Blown fuse on related circuit (occasionally)
  • Erratic or stuck switch behaviour for functions in Row 1

What to check

  • Read all stored DTCs with a compatible scan tool; note freeze frame and related codes
  • Visually inspect instrument cluster connectors and harness for corrosion, bent pins, or damage
  • Inspect harness routing for chafing or contact with sharp metal parts
  • Check related fuses and fusible links for open/short conditions
  • Backprobe the switch signal pin with a DMM to check voltage and continuity to ground

Signal parameters

  • With ignition ON: supply voltage to cluster ≈ 12 V (vehicle battery voltage)
  • Normal switch open: signal line high-impedance or pulled to supply via module (varies by design)
  • Normal switch closed: signal line toggles to ground or supply depending on circuit - check wiring diagram
  • Fault condition: signal line measures ~0 V (hard short to ground) when it should be open
  • Expected resistance: open circuit >>10 kΩ; closed (switch pressed) typically

Diagnostic algorithm

  1. Retrieve and record all related DTCs. Clear codes and attempt to re-produce to confirm fault.
  2. Consult the vehicle wiring diagram to identify the exact pin and wire for the Row 1 switch circuit.
  3. Visually inspect the instrument cluster, switch assembly and harness for water ingress, corrosion, or physical damage.
  4. With ignition OFF, disconnect the cluster/switch connector(s) and measure resistance from the suspect signal wire to ground. A near-zero resistance indicates a harness/connector short.
  5. If the short is present with the connector disconnected, follow the harness away from the cluster, inspecting and isolating sections (disconnect intermediate connectors) until the short disappears.
  6. If the short is only present with the connector connected, suspect the switch or cluster PCB. Swap or bench-test the switch if serviceable.
  7. Repair damaged wiring, clean/repair connectors, or replace the faulty switch or instrument cluster as indicated by isolation testing.
  8. After repairs, clear codes and verify proper operation of the Row 1 switches and that the B1208 does not return. Perform a road test if needed.

Likely causes

  • Insulation cut on harness where it rubs against bodywork
  • Corrosion/contamination in the switch or cluster connector
  • Solder/jumpers on the cluster PCB shorted to ground
  • Failed cluster switch module internally shorted
  • Pin pushed out of connector and contacting grounded shell

Fault status

⚠️ Status
Electronic instrument cluster Row 1 switch circuit shorted to ground. Check wiring, connector and switch/cluster for damage or corrosion.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1207 B1209 B1210 B1211 B1212
89

Browse 89 ALFA ROMEO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

ALFA ROMEO

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Code

B1208

FIAT B — Body

Electronic instrument cluster row 1 switch short to ground

Brand: FIAT
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring contacting chassis ground
  • Corroded or water-damaged connector or pin
  • Failed (shorted) switch or internal cluster PCB fault
  • Incorrectly installed aftermarket accessory tapping the circuit
  • Poor or loose connector making intermittent short to ground

Symptoms

  • One or more Row 1 switch functions do not operate
  • Permanent or intermittent dashboard warning or fault lamp
  • Stored B1208 (and possibly related) DTC(s) in the cluster
  • Blown fuse on related circuit (occasionally)
  • Erratic or stuck switch behaviour for functions in Row 1

What to check

  • Read all stored DTCs with a compatible scan tool; note freeze frame and related codes
  • Visually inspect instrument cluster connectors and harness for corrosion, bent pins, or damage
  • Inspect harness routing for chafing or contact with sharp metal parts
  • Check related fuses and fusible links for open/short conditions
  • Backprobe the switch signal pin with a DMM to check voltage and continuity to ground

Signal parameters

  • With ignition ON: supply voltage to cluster ≈ 12 V (vehicle battery voltage)
  • Normal switch open: signal line high-impedance or pulled to supply via module (varies by design)
  • Normal switch closed: signal line toggles to ground or supply depending on circuit - check wiring diagram
  • Fault condition: signal line measures ~0 V (hard short to ground) when it should be open
  • Expected resistance: open circuit >>10 kΩ; closed (switch pressed) typically

Diagnostic algorithm

  1. Retrieve and record all related DTCs. Clear codes and attempt to re-produce to confirm fault.
  2. Consult the vehicle wiring diagram to identify the exact pin and wire for the Row 1 switch circuit.
  3. Visually inspect the instrument cluster, switch assembly and harness for water ingress, corrosion, or physical damage.
  4. With ignition OFF, disconnect the cluster/switch connector(s) and measure resistance from the suspect signal wire to ground. A near-zero resistance indicates a harness/connector short.
  5. If the short is present with the connector disconnected, follow the harness away from the cluster, inspecting and isolating sections (disconnect intermediate connectors) until the short disappears.
  6. If the short is only present with the connector connected, suspect the switch or cluster PCB. Swap or bench-test the switch if serviceable.
  7. Repair damaged wiring, clean/repair connectors, or replace the faulty switch or instrument cluster as indicated by isolation testing.
  8. After repairs, clear codes and verify proper operation of the Row 1 switches and that the B1208 does not return. Perform a road test if needed.

Likely causes

  • Insulation cut on harness where it rubs against bodywork
  • Corrosion/contamination in the switch or cluster connector
  • Solder/jumpers on the cluster PCB shorted to ground
  • Failed cluster switch module internally shorted
  • Pin pushed out of connector and contacting grounded shell

Fault status

⚠️ Status
Electronic instrument cluster Row 1 switch circuit shorted to ground. Check wiring, connector and switch/cluster for damage or corrosion.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1207 B1209 B1210 B1211 B1212
Repair manuals

Manual library for FIAT

26

Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

FIAT

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Code

B1208

MITSUBISHI B — Body

LCD heater

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring contacting chassis ground
  • Corroded or water-damaged connector or pin
  • Failed (shorted) switch or internal cluster PCB fault
  • Incorrectly installed aftermarket accessory tapping the circuit
  • Poor or loose connector making intermittent short to ground

Symptoms

  • One or more Row 1 switch functions do not operate
  • Permanent or intermittent dashboard warning or fault lamp
  • Stored B1208 (and possibly related) DTC(s) in the cluster
  • Blown fuse on related circuit (occasionally)
  • Erratic or stuck switch behaviour for functions in Row 1

What to check

  • Read all stored DTCs with a compatible scan tool; note freeze frame and related codes
  • Visually inspect instrument cluster connectors and harness for corrosion, bent pins, or damage
  • Inspect harness routing for chafing or contact with sharp metal parts
  • Check related fuses and fusible links for open/short conditions
  • Backprobe the switch signal pin with a DMM to check voltage and continuity to ground

Signal parameters

  • With ignition ON: supply voltage to cluster ≈ 12 V (vehicle battery voltage)
  • Normal switch open: signal line high-impedance or pulled to supply via module (varies by design)
  • Normal switch closed: signal line toggles to ground or supply depending on circuit - check wiring diagram
  • Fault condition: signal line measures ~0 V (hard short to ground) when it should be open
  • Expected resistance: open circuit >>10 kΩ; closed (switch pressed) typically

Diagnostic algorithm

  1. Retrieve and record all related DTCs. Clear codes and attempt to re-produce to confirm fault.
  2. Consult the vehicle wiring diagram to identify the exact pin and wire for the Row 1 switch circuit.
  3. Visually inspect the instrument cluster, switch assembly and harness for water ingress, corrosion, or physical damage.
  4. With ignition OFF, disconnect the cluster/switch connector(s) and measure resistance from the suspect signal wire to ground. A near-zero resistance indicates a harness/connector short.
  5. If the short is present with the connector disconnected, follow the harness away from the cluster, inspecting and isolating sections (disconnect intermediate connectors) until the short disappears.
  6. If the short is only present with the connector connected, suspect the switch or cluster PCB. Swap or bench-test the switch if serviceable.
  7. Repair damaged wiring, clean/repair connectors, or replace the faulty switch or instrument cluster as indicated by isolation testing.
  8. After repairs, clear codes and verify proper operation of the Row 1 switches and that the B1208 does not return. Perform a road test if needed.

Likely causes

  • Insulation cut on harness where it rubs against bodywork
  • Corrosion/contamination in the switch or cluster connector
  • Solder/jumpers on the cluster PCB shorted to ground
  • Failed cluster switch module internally shorted
  • Pin pushed out of connector and contacting grounded shell

Fault status

⚠️ Status
Electronic instrument cluster Row 1 switch circuit shorted to ground. Check wiring, connector and switch/cluster for damage or corrosion.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1207 B1209 B1210 B1211 B1212
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1208

Other B — Body

EIC Switch-1 Assembly Circuit Short To Ground

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring contacting chassis ground
  • Corroded or water-damaged connector or pin
  • Failed (shorted) switch or internal cluster PCB fault
  • Incorrectly installed aftermarket accessory tapping the circuit
  • Poor or loose connector making intermittent short to ground

Symptoms

  • One or more Row 1 switch functions do not operate
  • Permanent or intermittent dashboard warning or fault lamp
  • Stored B1208 (and possibly related) DTC(s) in the cluster
  • Blown fuse on related circuit (occasionally)
  • Erratic or stuck switch behaviour for functions in Row 1

What to check

  • Read all stored DTCs with a compatible scan tool; note freeze frame and related codes
  • Visually inspect instrument cluster connectors and harness for corrosion, bent pins, or damage
  • Inspect harness routing for chafing or contact with sharp metal parts
  • Check related fuses and fusible links for open/short conditions
  • Backprobe the switch signal pin with a DMM to check voltage and continuity to ground

Signal parameters

  • With ignition ON: supply voltage to cluster ≈ 12 V (vehicle battery voltage)
  • Normal switch open: signal line high-impedance or pulled to supply via module (varies by design)
  • Normal switch closed: signal line toggles to ground or supply depending on circuit - check wiring diagram
  • Fault condition: signal line measures ~0 V (hard short to ground) when it should be open
  • Expected resistance: open circuit >>10 kΩ; closed (switch pressed) typically

Diagnostic algorithm

  1. Retrieve and record all related DTCs. Clear codes and attempt to re-produce to confirm fault.
  2. Consult the vehicle wiring diagram to identify the exact pin and wire for the Row 1 switch circuit.
  3. Visually inspect the instrument cluster, switch assembly and harness for water ingress, corrosion, or physical damage.
  4. With ignition OFF, disconnect the cluster/switch connector(s) and measure resistance from the suspect signal wire to ground. A near-zero resistance indicates a harness/connector short.
  5. If the short is present with the connector disconnected, follow the harness away from the cluster, inspecting and isolating sections (disconnect intermediate connectors) until the short disappears.
  6. If the short is only present with the connector connected, suspect the switch or cluster PCB. Swap or bench-test the switch if serviceable.
  7. Repair damaged wiring, clean/repair connectors, or replace the faulty switch or instrument cluster as indicated by isolation testing.
  8. After repairs, clear codes and verify proper operation of the Row 1 switches and that the B1208 does not return. Perform a road test if needed.

Likely causes

  • Insulation cut on harness where it rubs against bodywork
  • Corrosion/contamination in the switch or cluster connector
  • Solder/jumpers on the cluster PCB shorted to ground
  • Failed cluster switch module internally shorted
  • Pin pushed out of connector and contacting grounded shell

Fault status

⚠️ Status
Electronic instrument cluster Row 1 switch circuit shorted to ground. Check wiring, connector and switch/cluster for damage or corrosion.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1207 B1209 B1210 B1211 B1212
9,088

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